my little brother has an EP HAMMER and i helped him with making it a little faster.here are the mods so far proboat esc monster maxx 19t single wound motor and 10 cells gp3300 and y535 purple prop its wicked fast but when he runs it full throttle the steering servo gets way out of wack.like it'll turn right and left by it self.i changed out the servo changed out the rx and changed out the esc but the same thing happens.Could it ossibly be the motor??